setBatchMode(true);
  run("Clear Results");
  run("AuPbSn 40 (56K)");
  t0 = getTime;
  size=25;;
  for (i=0; i<1000000; i++) {
      x = round(random()*(getWidth-size));
      y = round(random()*(getHeight-size));
      makeRectangle(x, y, size, size);
     getStatistics(area, mean);
     setResult("X", i, x);
     setResult("Y", i, y);
     setResult("Mean", i, mean);
   }
  updateResults;
  print((getTime-t0)/1000+" seconds");